Complementarity · A unifying model: bulk chondrite complementarity by individual chondrule-matrix mentality
„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“
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- 2018-08-01 → 2020-07-31
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Накратко на български
Хондритните метеорити и връзката между техните компоненти – топките хондрули и богатата на вода матрица – разкриват как са се формирали първите твърди тела в Слънчевата система. Това помага да се разбере произходът на водата и органичните молекули, необходими за появата на живот на Земята.
Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.
Резултати накратко
A unifying model: bulk chondrite complementarity by individual chondrule-matrix mentality
Our Solar System consists of a central star, our Sun, and eight (confirmed) orbiting planets. The Earth, so far, is the only planet on which life is found. One of the fundamental questions to our existence is, therefore, how this life was formed and what the initial conditions were for life to start. To answer this, we must investigate how our Solar System and our planet formed and evolved over time. For life to evolve on Earth, critical starting materials were needed, such as water and complex organic molecules from which eventually RNA, DNA and cells were formed. We need to unravel what Earth’s building blocks are with respect to these prebiotic molecules to understand how life could initiate in exoplanetary systems and, finally, to answer: are we truly alone in the universe? The key building blocks of the rocky planets in our Solar System may be represented by chondrules, once molten silicate spherules that are the main constituents of chondritic meteorites. These in turn are fragments of asteroids, planetary bodies that did not make it into becoming planets. When studying these chondritic fragments, we are probing the very first solids that agglomerated in the Solar System and with that, the initial conditions that are key to Earth’s habitability. Chondrites mainly consist of volatile-depleted chondrules and volatile-rich matrix, which contains water and organics. Potential genetic links between the chondrules and matrix can provide important clues into how actively these components were transported throughout our Solar System before finally being accreted into planets and asteroids. For example, did Earth acquire a matrix-component only from the relatively dry inner Solar System or could this component have arrived from the wet outer Solar System, from regions were comets and icy planets accreted? Answering this question is critical to understand how and when prebiotic molecules arrived on Earth. Hence, the main objective of this project was to investigate the genetic links, or potential complementarity, between chondrules and matrix by probing their chemical and isotopic make-up. The current state of the art is undecided whether complementarity exists or not.
Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз
Цел на проекта
The so far unique role of our Solar System in the universe regarding its capacity for life raises fundamental questions about its formation history relative to exoplanetary systems. Central in this research is the accretion of asteroids and planets from a gas-rich circumstellar disk and the final distribution of their mass around the central star, our Sun. The key building blocks of the planets may be represented by chondrules, once molten silicate spherules that are the main constituents of chondritic meteorites, which in turn are primitive fragments of planetary bodies. Chondrule formation mechanism(s), as well as their subsequent storage and transport in the disk are still poorly understood and their origin and evolution can be probed through their link to unprocessed dust that accreted together with chondrules in chondrites. Contrastingly, while bulk chemical and isotope analyses of this dust (the matrix) and chondrules indicate that these components formed co-genetically in a single reservoir, individual analyses of chondrules suggest that they formed over a range of space and time, requiring storage and transport mechanisms. The candidate proposes to unify these seemingly opposing data in a single model that will result in significant and timely progress on the frontiers of Solar System research, including a bridge to astrophysical simulations that tackle planet formation and physicochemical constraints on the origin of chondrules. This model invokes bulk chondrule-matrix complementarity as a result of genetic relationships between individual chondrules and their dust rims. The necessary development of analytical methods to verify this hypothesis will contribute greatly to the advancement of small sample analyses, including cometary grains from sample return missions and interplanetary dust particles.
Оригинален текст от CORDIS (на английски).
Участници
- INSTITUT DE PHYSIQUE DU GLOBE DE PARIS · ParisКоординаторФранция
Връзки
Данни: CORDIS, © Европейски съюз